The way donors and NGOs respond to emergencies has changed; emergency cash transfers to affected people are increasingly used to respond to disasters. We worked with CaLP to develop the Cash Atlas, an interactive tool to explore who is donating, to which countries and for what causes. Using open source tools like CartoDB and PHP Symfony2, we were able to provide users with a number of sophisticated analytical tools to explore the data, create live maps and visualisations and generate reports on the fly. Launched in 2013, the data from more than 1,000 projects was uploaded. However, the reliance on voluntary submissions meant that the record was becoming increasingly incomplete and in May 2017, CaLP took the decision to take the Cash Atlas offline.